Microwave filter

  • US 4,074,214 A
  • Filed: 09/20/1976
  • Issued: 02/14/1978
  • Est. Priority Date: 09/20/1976
  • Status: Expired due to Term
First Claim
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1. A transmission line filter for passing signals having frequencies within a passband centered about a first predetermined frequency and attenuating signals having frequencies within a stopband centered about a second predetermined frequency, the filter comprising:

  • a central transmission line having an input terminal and an output terminal for receiving signals at its input terminal and passing the same to said output terminal; and

    first, second and third stubs, each stub of predetermined dimension and coupled to the transmission line at a predetermined location such thata. the first and second stubs resonate with the third stub at the first predetermined frequency,b. at least one of the first and third stubs attenuates transmission line signals having frequencies within the stopband, andc. the third stub attenuates transmission line signals at a flyback frequency, which flyback frequency is created within the stopband by an interreaction between the stubs.

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